Earlier this morning Har Mar Superstartweeted "Heading into my first Mats rehearsal! Wish me luck. #ThisIsInsane" which, as SPIN has since confirmed, is not a joke.

UPDATE: Actually it was and on me too. SPIN updated their post and Jessica Hopper admitted, "Well, that was a curious event. Sean was just punking me/you/us about joining the Replacements. Good thing no one wrote, like, news items about it."

We believed, obviously. Har Mar just tweeted, "I am, however, playing tambourine in Hüsker Dü this fall." Sean Tillman, you're a funny guy.

Sean Tillmann, a.k.a. Har Mar Superstar, is not The Replacements’ new guitarist, despite reports to the contrary.

“Heading into my first Mats rehearsal! Wish me luck,” the flamboyant live performer and frequent practical joker wrote on Twitter today. He then tweeted a story from SPIN about him being the band’s new guitarist.

Reached for comment, a representative for the band said the news was untrue.

As of today, The Replacements have yet to announce the guitarist and drummer who will be accompanying Paul Westerberg and Tommy Stinson for their upcoming appearance at Riot Fest Chicago, Riot Fest Toronto, and Riot Fest Denver.